Diamond polishing device



Nov. 13, 1945. B. LEVY DIAMOND POLISHINGDEVICE Filed. May 12,

1944 2 Sheets-Sheet 1 INVENTOR. BA kit/CH l EVK ArrKA/EX .Nov. 13, 1945. B. LEVY 2,388,751

DIAMOND POLISHING DEVICE Filed May 12, 1944' 2 Sheets-Sheet 2 INVENTOR. B/MUf H L E V K fl TTORNEY.

BY angry/MM.

Patented Nov. 13, 1945 UNITED STATES PATENT OFFICE DIAMOND POLISHING DEVICE Baruch Levy, New York, N. Y.

Application May 12, 1944, Serial No. 535,259

3 Claims.

This invention relates to diamond cutting and polishing machines.

An object of this invention is to provide a machine of the character described comprising a base adapted to be fixed to a table a support slidably mounted thereon, an arm pivoted to the support, a slide adjustable on the arm vertically, a lever pivoted to said slide and adjustable angularly thereon about a horizontal axis, and a diamond on said lever adjustable about its own axis, whereby a diamond held by the diamond holder may be brought to any desired position for cutting or polishing facets thereon.

Another object of this invention i to provide means to regulate the axial rotation of the diamond holder and for measuring the degree of rotation, and for locking the diamond holder at predetermined angularly spaced positions.

Yet another object of this invention is to'provide in a machine of the character described a diamond holder comprising a stem having means to center the diamond, and a clamp surrounding the stem and having cutaway portions, and portions adapted to engage a diamond pressed thereagainst by the stem, spring means being provided to normally release the clamp, and screw threaded means being provided to move the clamp in a position for clamping the diamond against the stem. 1

.Another object of this invention is to provide in a machine of the character described a base provided with a longitudinal screw, a support slidably mounted on the base and provided with a pair of half-nuts engaging the screw whereby rotation of the screw will move the support longitudinally of the base for fine adjustment, and said half-nuts being movable out of engagement with respect to the screw topermit rough adjustment of the support relative to the base.

Another object of this invention is to provide a sturdy and compact machine of the character described which shall be relatively inexpensive to manufacture, easy to manipulate and adjust, and which shall yet be practical and efficient to a high degree.

Other objects of this invention will in part be obvious and in part hereinafter pointed out.

The invention accordingly consists in the features of construction, combinations of elements, and arrangement of parts which will be exemplified in the construction hereinafter described, and of which the scope of application will be indicated in the following claims.

In the accompanying drawings, in which is shown various possible illustrative embodiments of this invention- Fig. 1 is a front elevational View of a machine embodying the invention.

Fig. 2 is an end view thereof.

Fig. 3 i a top plan view of the diamond holder and lever supporting the stem.

Fig. 4 is a side elevational view of the diamond having facets which may be cut or polished with the machine embodying the invention.

Fig. 5 is a cross-sectional view taken on line 5--5 of Fig. 1.

Fig. 6 is a top plan view of the machine shown in Fig. 1.

Fig. 7 is a top plan view of the lever controlling the clamp for the diamond holder.

Fig. 8 is an elevational cross-sectional view of a diamond holder without the clamp, illustrating the method of polishing or cutting the table of the diamond on an abrasive wheel.

Fig. 9 i an elevational cross-sectional view of the diamond holder showing a diamond clamped in the holder.

Fig. 10 is a side elevational view of the screw for adjusting the diamond holder about its axis Fig. 11 is a cross-sectional View taken on line H-H of Fig. 3.

Fig. 12 is a cross-sectional detail of the part shown in Fig. 11.

Fig. 13 is an elevational transverse cross-sectional view of the screw on the base for adjusting the support longitudinally and showing a pair of half-nuts to permit quick rough adjustment of the support relative to the base.

Fig. 14 is a cross-sectional view taken on line I4I4 of Fig. 13.

Referring now in detail to the drawings, l0 designates a diamond cutting or polishing machine of the character described. The same comprises a base II which may be bolted or otherwise secured to a table or other support l2. The base H comprises a pair of parallel angleshaped members l3 each having a horizontal wall l4 and a vertical wall [5. The horizontal walls have openings I6 for attachment to the support. The vertical walls l5 are interconnected by a pair of parallel horizontal rods or bolts l'l.

Journalled on and between the walls [5 is a horizontal screw I8. Fixed to one end of the screw is a hand wheel is provided with a handle 20. Slidably mounted on base II is a support 22. Said support comprises a channel-shaped member 23 having parallel vertical front and rear walls 24 interconnected by sleeves 25 through which the rods I! pass. On one of the walls 24 is a nut 26 receiving the threads of screw I8. It will be noted that rotation of wheel I9 will cause support 22 to slidably move on the base.

Fixed to one of the walls i is an upwardly extending stop member 30, formed with a central notch 3| at its upper end for the purpose herein- .the flanges 33 and has pivoted openings through which the pivot 34 passes. The bo'ttoinedge 31d of rib 3'! is adapted to rest in notch 3! of stop 38 for maintaining arm 35 in horizontal position.

On top wall 36 is a handle 38 to permit the arm to be lifted upwardly for the purpose herein-.

after appearing.

Fixed to one end of arm 35 is b acket 48. Bracket 46 comprises a pair of similar bracket arms 4| attached to opposite sides of web 37. Fixed to the bracket arms 4| is a grooved vertical member 42 havinga ,verticalsdovetailed slot or groove 43. At the upper end of member 42 is a collar 44. Journalled in said collar 44 is a vertical screw 45 having. aknurled knob 46 at its up per end. Slidably mounted on member 42 is a slide 41 having a dovetailed projection,48 received .in the groove 13*. Extending from slide 41 through a slot 58 in member 42 is .a lug 5| formed with a screw-threaded opening receiving the threads of screw 45. It will now be understood that as knob 46 is turned, slide. 41 .will be moved up or down depending on the direction of rotation of said knob.

,Journalledpnmember ,4! .is a vertical worm shaft 53, carrying a worm;5.4 Attheupper end of the worm shaft 53 is.'a;knu rled knob 55 for rotating said shaft., Atthe .lower end of said shaft is a bevelgear 56. Alsojournalled on slide/4! is a. horizontal shaft 51 provided with a knob 58 at its outer end and carrying a bevel gear 59 meshing with bevel gear .56.. Thus shaft 56 can be rotated either by knob 55 or knob 58.

Slide 41 is provided with an extension 60 carrying a horizontal shaft 6| on which is mounted a worm wheel 62 meshing with worm 54. 'O'n'shaft 5| is .a pointer 63. adapted to cooperate witha substantially semi-circular scale 64 fixed to slide 41. Fixed to..shaft 6| is'an arm 66 adapted to rotate with worm wheel 62. On top of member "66 is an annular scale 6'! for the purpose hereinafter appearing. U s r.

Member 66 is formed with a through opening ID in which is mounted a shaft "II (Fig. 11). .At the upper end of the shaft II is .a pointer 12 adapted to cooperate with the scale 61. On shaft 18 is,a worm wheel '|3.l Member '66 is formed with a screw-threadedopening I4 and with a through opening 75 disposed at. right angles thereto and communicating therewith.

Screwed within the opening 14 is a sleeve I6 formed with a transverse slot 11 at its upper end. Tubeor sleeve, 16 is formed with an internal shoulder I8. With said tube is a'pin 88 having screw threads at itsupper, en'd. Pin 80. is formed with an enlarged collar 8| above the lower reduced end. 82 thereof. ,Interposed between collar 8| and shoulder I8 is a coil compression spring'83. Screwed to the upper end of pin .86 is a knob 84, .Knob 84 has a knurled portion 85 at its upper end andis formed with afltransverse central "web- 86. The web 86 is formed With acen'tral threaded opening 81 to be screwed to the threaded upper end portion of pin 80. Thus the pin is first pressed upwardly above the tube I6, member 84 is screwed thereto, and then the web 86 is permitted to enter the slot 11.

The lower end 82 of pin 80 projects into opening 15. Within opening I5 is a member 90. Member 90 has a Worm portion 9| meshing with the worm wheel I3. At its upper end, member 98 has "a knob 92. Said member furthermore is formed with transverse through openings 93 adapted to receive selectively the lower end 82 of pin 80. Said member 90 is rotatably mounted in opening I5. Upon lifting up member 84 pin 88 is withdrawn from engagement with member 96. Member 98 may then be rotated for rotating shaft 'l|. The pointer I2 shows the angular position of shaft 1 I. It will be noted that each time member -64is raised handle 92 can be turned a little and then the pin 88 is released permitting knob '92 'to rotate one-quarter turn until pm 82 is-again projected into opening 93. Thus'the operator can control rotation of shaft TI through predeterini'ned equal angles Whereby'to facilitate grinding,

' polishingor cutting facets at equal angles around a diamond as will appear hereinafter.

Shaft 1| is formed at its lower end with a socket I00. Inserted'i nto thesocketisoiieeiid 01' a stem ml which may e held in place by a set screw Icahn the shaft. Stem I'8Iji's thusreplaceable and stems of v rious shape and ize may be used, eac beingpio'vid'ed with differently shaped center-ingsocket I03 tofit'tlle'sliafie of the "diamond. 'Iil "Fig."9 one shapecerltering socket is shown, "ari'd in Fig. -8 another shape'cen: tering socketisillus'trated. The diamond His is centered within the=socket I03.

Means is provided to clamp 'the diamond against the 's'temIIlI. To this end member is provided with a fulcrum member I'll "to which is pivoteda lever "Atoneend of lever-I I is a bifurcatedarml I2 and 'at the otherend of said lever is "a bifurcated arm 3. Bifurcated arms ||2'sti:addle"a clampcup or sleeve'l I'4. Cup-I I4 comprises'a cylindrical portion I I5 telescoped on the lowr'end'of shaft "'II. Said'member I I4 is provided with 'anend' wall -'I I 6 formed with 'acentral'cutollt II'I. One si'de'of'cylindricalwalllI5 as well as part of the bottom wall I I 6 is cutaway as at I 8 toexpose part ofthe stem and diamond. The bottom wall 'II'6 engages the underside' of the diamond and serves 'as 'a stop topress the sameag'ainstthe 'stem'flll. Y I

"Interposed' between sleeve I I5' a'nd member66 is 'a'coil compression spring I28 "which normally biases end wall I I6 "a'wayirom the -'stem torelease the diamond. v

Mean's'is provided, how ver, to pressena can I I6 against the diamond. To this enema bifurcated arms lfssuppor't a nut I2-I. screwed-to said nut 'isa screw stem I22 carryingakiiob' T23 at one end. Screw lei pressesag'ain'st'tlie uh erside of avvall I24 attaehed-tomember 'ts. Retation of knob I23 in one direction "will serve 'm rotate lever III in a clockwise direction look'i'ng atFigQ 1 or thefdrawir'ig's, to press theqowr end wall I I6 of member-I llagai'nstthdiamcndj'tlius clamping the niamcnq against the" s't'em. It'will be noted that-shaftffl can be rota't'ed'for turning the diamond wh'nenieinter I I 4 remains station'- ary. It" wnrnow 'be understood that tlie-diamdnd while claiiiped can te rotate'aravenous angles for polishing or c tting-venuessurgares'tterebr on the grinding or'abi'a'sive' I25; Furthermore, arm 35 can be lifted up so that the operator can inspect the diamond.

Adjustments which can be obtained are as follows:

The support 22 can be adjusted to the left or right by turning the wheel IS.

The slide 41 can be moved vertically up or down by turning knob 46.

Member 66 can be rotated about a horizontal axis by either turning knob 55 or knob 56.

The shaft H may be rotated about its axis by turning knob 92.

The angle of member 66 is designated by scale 64 and pointer 63.

The angle of the diamond with respect to its own aXis is designated by pointer 12 of scale 61.

The support 22 may be adjusted for fine adjust-- ment by turning wheel l9.

Means may be provided for permitting rough adjustment of the support 22 relative to the base II. The structure for carrying out such adjustment is illustrated in Figs. 13 and 14. In said figures there is shown a longitudinal screw l8 and the support 22. Engaging opposite sides of said screw are a pair of half-nuts I30 pivoted together as at I3I. The half-nuts are biased together by interconnecting tensioning spring I32. Attached to the half-nuts are handles I33. When the handles are pressed together the half-nuts separate and permit the support 22 to be pushed to the right or left. Upon releasing the half-nuts they will engage screw l8 so that rotation of the handle I9 will finely adjust the position of support 22.

It will thus be seen that there is provided a device in which the several objects of this invention are achieved, and which is well adapted to meet the conditions of practical use.

As various possible embodiments might be made of the above invention, and as various changes might be made in the embodiments above set forth, it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a diamond cutting machine, a member formed with an opening, a shaft rotatably mounted in the opening, a stem fixed to said shaft, means to rotate said shaft about its axis, a

non-rotatable clamp slidably mounted on said shaft and adapted to press a diamond within said clamp against said stem, said clamp comprising a cylindrical wall and an end wall, said end wall being formed with a central opening, said end wall and cylindrical wall being formed with a cutaway portion, said end wall being adapted to engage the underside of a diamond to press the diamond against the stem, said stem being provided with a centering socket adapted to receive a portion of said diamond, a lever pivoted to said member and having an arm engaging said clamp, said lever having a second arm supporting a nut, and a screw screwed to said nut and engaging said member for rotating said lever for moving the clamp relative to the shaft.

2. In a diamond cutting machine, a member formed with an opening, a shaft rotatably mounted in the opening, a stem fixed to said shaft, means to rotate said shaft about its axis, a nonrotatable clamp slidably mounted on said shaft and adapted to press a diamond within said clamp against said stem, said clamp comprising a cylindrical wall and an end wall, said end wall being formed with a central opening, said end wall and cylindrical wall being formedwith a cutaway portion, said end wall being adapted to engage the underside of a diamond to press the diamond against the stem, said stem being provided with a centering socket adapted to receive a portion of said diamond, a lever pivoted to said member and having an arm engaging said clamp, said lever having a second arm supporting a nut, and a screw screwed to said nut and engaging said member for rotating said lever for moving the clamp relative to the shaft; and means to bias the clamp away from said member to move the end wall of said clamp away from the stem for releasing a clamped diamond for rotation.

3. In. a diamond cutting machine, a base, a screw on said base, a handle on the screw for rotating the same, a support slidably mounted on the base screwed thereto, means on the support engaging the screw on the base, an arm pivoted to said support, said arm having an outwardly extending web, and a stop on said base formed with a notch to receive said web, and a diamond holder mounted on said arm, said screw-threaded means on the support comprising a pair of separable half-nuts engaging the screw on said base.

BARUCH LEVY. 

